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03-30-2012, 10:02 AM | #1 |
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New rear tires causing DSC to go off?
I recently replaced my rear tires with a pair of Goodyear F1 Asymmetric 2. The fronts are still the previous version Goodyear F1 Asymmetrics. On sweeping freeway onramp and offramps, DSC kicks in very very early, causing the car to understeer pretty dramatically.
Now before anyone says "the tires need to be broken in", there tires have well over 500 miles AND I can't even break them loose on hard corners stomping on the accelerator, so I'm very confident that they have plenty of grip. From what I've read, it seems like the rear tires are probably bigger than the fronts, resulting in the car thinking the rotational speed between the front and rears are off, causing the DSC to kick in. Assuming that's the case, is there any way to reset the sensor associated with the DSC? My front's still have about 40% tread, so I don't really want to replace them. |
03-30-2012, 10:15 AM | #2 | |
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03-30-2012, 10:37 AM | #3 | |
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I'm not sure about the answer to your question about reprogramming DSC, but your conclusion about the difference in rotational speeds is accurate.
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03-30-2012, 10:50 AM | #4 |
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DSC requires a circumferential difference of at least 5% to make a fuss. If you retained stock diameters then even fully worn front down to the cords vs brand new rears won't have more than 1% difference in overall circumference.
DSC's not the issue here. If there's a dramatic difference in age and use between the front and rear wheels, there can be a significant enough difference in grip for DSC to start complaining.
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03-30-2012, 10:58 AM | #5 | |
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03-30-2012, 11:04 AM | #7 |
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03-30-2012, 01:48 PM | #11 |
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That sounds about right. For my 07 Si with 225/40f and 255/35r the door jamb sticker shows 33f and 39r. From other posts, it seems that BMW dropped the pressure to 38 for the rears on later cars?
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03-30-2012, 02:07 PM | #13 |
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I run 35psi all round. Perfect.
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03-30-2012, 03:13 PM | #14 |
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My 07 si with the sports package (225/40, 255/35) says 33/38 on the door jamb. Mines a roadster though, so many it's 1 less than the coupe?
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03-30-2012, 04:08 PM | #15 |
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exactly what I run, thats why I was so surprised
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03-30-2012, 04:09 PM | #16 |
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drop the rears to 30psi for better traction broski
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03-30-2012, 04:59 PM | #18 |
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30psi is way to low for me...... i do more track work remember, ideal hot temps are 40psi, im running the stock CSL rims with stock csl sizes, they were bmw recommended 35psi all round and this works very well for me... i tried it lower and i dont like the soft feel to the car.....
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03-30-2012, 07:28 PM | #20 |
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OP - What tire sizes do you have on the car right now?
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03-30-2012, 09:31 PM | #21 | |
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Here's how to determine the production date - http://www.tirerack.com/tires/tirete....jsp?techid=11. While you're looking, check for dry rot, which looks like fine cracks in your tire. When it occurs, I usually see it around the base of the tread blocks. |
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